Quick-motion valve



(No Model.)

J. H. FA-GAN.

QUICK MOTION VALVE.

Pategted Nov. 6, 1888.

UNITED STATES- PATENT OFFI E.

JAMES H. FAGAN, OF CHICAGO, ILLINOIS.

QUICK-MOTION VALVE.

SPECIFICATION forming part of Letters Patent No. 392,417, dated November 6,1888.

Application filed June 29, 1888.

.To all whom it may concern:

Be it known that I, JAMES H. FAGAN, of Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Quick-Motion Valves; and I do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawings,and to the letters of reference marked thereon, which form a part of this specification.

This invention relates to an improvement in quick-motion valves, or valves which are so constructed that they may be opened and closed either by the use of a hand-wheel and screwshaft or by the employment of alever adapted to move the valve independently of the screwshaft.

The invention consists in the matters hereinafter described, and pointed out in the appended claims.

In the accompanying drawings, illustrating myinvention, Figure l is acentral axial section taken through the valve-casing of aglobe-valve, illustrating one desirable form of my invention. Fig. 2 is a, sectional elevation of the same, taken upon line 2 2 of Fig. 1. Fig. 3 is a detail section taken upon line 3 3 of Fig. 1. Fig. 4 is a View of a movable screw-threaded bushing separate from the other parts. Fig. 5 is a View of the ring connecting the hand-lever with the valve-stem separate from the other parts.

As illustrated in the said drawings,A is the valve shell or casing, which is constructed in the same manner as heretofore common in globe-valves.

13 is the valve-disk, which is fitted to the valve-seat A, and O is the valve-stem,having rotatable connection with the valve-disk. Said Valve-stem is smooth and eylindric in its part adjacent to the valve-disk B and is screwthreaded in its outer part and provided with a hand-wheel, G, at its outer end. The cylindric part of the said stem passes through a stuffing-box or gland, d, in a removable cover or cap, D, which is secured to the valvecasing A. To the said head D is attached a metal yoke, D, in the outer part of which is supported a sleeve or tubular nut, E, having interior screw threads engaging the screw threaded part of the valve-stem. The yoke D is herein shown as cast integral with the Serial No.2l8,5 l9. (No model.)

said cap D. The nut E is constructed to slide endwise in the yoke D, and is held from turn ing therein by means of a key or feather, d, in the yoke, which engages a longitudinal groove, 0, in the outer surface of the said nut.

Said nut is made of such length that it will remain in engagement with the yoke when moved endwise in the yoke a distance equal to the throw of the valve. Said nut is provided at its inner end with a flange, c, and is provided opposite the outer surface of the yoke D with a notch, c, which is adapted for engagement with a swinging detent, F, by which said nut may be locked and held securely from endwise movement in the yoke. The nutis adapted to be locked at the time that it is thrust outwardly, and when secured in this position operates in the same manner as the stationary nut commonly present in v globe-valves to enable the valvedisk to be moved by the turning of the screw-threaded valve-stem engaged with the said nut. When the valve is open, however, the nut may be released by moving or shifting the detent F free from the notch 0 when the valve-stem may be thrust bodily inward, carrying with it the said nut,until the valve is closed.

For giving endwise movement of the valvestem when the nut E is disengaged from the yoke devices are provided as follows:

G isahand-lever, which is pivotally engaged at one end with one of the side pieces of the yoke D and extends outside or beyond the opposite yoke-piece, and is adapted to be grasped by the hand at its free end. Said hand-lever is engaged with the valve-stem O by means of a ring, R, which is fitted within a groove, 0, in the valve-stem, and is provided with hearing pins or trunnions h 71, which engage with the opposite sides of a ring-shaped part of the said hand-lever G. Said ring H is herein shown as made in two parts provided with lugs h h at their meeting ends and as secured together by bolts or rivets passing through said lugs. The connection described between the valve-stem and the lever G obviously allows the stem to turn freely while preventing endwise movement of the stem with relation to the hand-lever.

I is a pawl mounted upon the lever G and adapted toengage at its free end with a series of notches, J, formed in the side of the yoke ICC D. The pawl I has an arm, I, by which it may be easily moved, said arm 1 extending toward the free end or handle of the lever G.

dis a spring for moving the pawl I, said spring being herein shown as of coiled form and connected at its opposite ends with a pin, *1, in the handle I and with a pin, g, in the lever G. The pins t" and g are so disposed with relation to the pivot of the pawl I that said spring will hold said pawl in engagement with the notches J when the said pawl is thrown into engagement with the same, but will hold the said pawl away and free from the said notches when the pawl is swung in such position as to carry the pin 1" to the opp osite side of the pivot of the pawl I from that occupied by it when the parts are in the position shown in the drawings. Said pawl I enables the valve to be locked in its closed position or held from furtheroutward movement when partially opened. Said pawl is, however, used only when the hand-lever G is alone em ployed for moving the valve, it obviously being necessary that said hand-lever should be free when the valve is opened or closed by the use of the hand-wheel.

The operation of the device constructed as above described is as follows: \Vhcn the valve is open and it is desired to quickly close the same, the detent F is swung clear of the notch c' so as to leave the nut E free to move in the yoke, and the lever G is then grasped and the valve closed, the pawl I being allowed to engage the notches J, so as to hold it closed it necessary or desirable; In opening the valve by the use of the lover G the pawl I is released from the said notches J, and the hand-lever actuated as before. In case it is desired to open the valve by the use of the hand-wheel alter it has been closed by the employment of the hand-lever, in which case the nut E will be left at the inward limit of its movement, the hand-wheel is first turned so as to back the nut outwardly into place, and as soon as the flange c of the nut strikes the yoke the nut is locked in place by the use of the detent F, when a reverse movement of the hand-wheel operates to open the valve.

As a simple and convenient means of mounting the hand-lever G in the yoke 1), I provide the said yoke with slots d" and d in its opposite sides and insert the hand lever t-h rough said slots. The'cnd of the hand-lever is made circular, as indicated at 9", so that it will fit and turn within the said slot (1", it being, of course, understood that the lever in this construction also slides endwise in said slot (I as said lever is moved, owing to its pivotal connection with the valvestem. The slot d serves to guide the free end of the lever in its movement. I have herein shown the cap D as secured to the valve-easing A by means of a series of bolts, a a a, placed at equal distances apart about the margins of the cap. By this construction I am enabled to place the said cap in any desired angular position upon the valve-casing, so that the hand-lever G may be placed in a position or at an angle most convenient for operation whatever may be the position or location of the valve-casin The valve adapted for quick operation in the manner described is especially useful as ap plied to the throttle-valve of steam-engines, it being often very desirable, as is well known to engineers, to cut off the steam very quickly as, for instance, in case of accident to the en gine.

I have herein shown the valve actuating devices as applied to a globe-valve; but it is obvious that the same features of construction may be employed in other valves which are opened and closed by a rectilinear movement of a stem, shaft, or other part by which the valve is either directly or indirectly actuated.

I claim as my invention 1. 'Ihecombination,with a valvcandascrewthreaded stem or shaft for actuating the valve, of a longitudinally-movable nut engaging said shaft, means for locking the nut from move ment endwise, and a hand-lever engaged withthe said valve stem or shalt, substantially as described.

2. The combi nation, with a valve and a screwthreaded valve stem or shaft, of a longitudinally-movable nut engaged with said shaft, means for locking the nut from endwise movement with the shaft, a hand-lever engaging the shaft, and a locking device for holding the handlever from movement, substantially as described.

3. The combination, with a valve-casing and yoke attached thereto and a valve-disk, of a screw-threaded valve stem or shaft, a longitudinally-movable sleeve or nut supported and sliding endwise in the said yoke, a locking device or detent for holding the nut from endwise movement, a hand-lever pivotally connected with the yoke and engaging the said valve stem or shaft, and a detent or paw] upon the hand-lever, said yoke being provided with notches to engage said pawl, substantially as described.

In testimony that I claim the foregoing as my invention I affix my signature in presence of two witnesses.

JAMES H. FAGAN.

Witnesses:

G. CLARENCE Pootn, E. B. ELLIAS. 

